McLean, Fairfax County, Virginia

Dolley Madison Boulevard

Two and a half kilometres of Route 123 under the Capital Beltway, with 16 junctions and grades to 11%.

Route 123 at full width, two to four lanes each way with turn lanes and signals, passing under the Beltway and its express lanes. The trees come from Fairfax County's 2022 LiDAR canopy survey, the buildings take their heights from the same flight, and the road follows USGS 1-metre LiDAR as it drops 63 metres toward Tysons.